27505991 has 2 divisors, whose sum is σ = 27505992. Its totient is φ = 27505990.

The previous prime is 27505987. The next prime is 27505997. The reversal of 27505991 is 19950572.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27505991 - 2² = 27505987 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27505997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13752995 + 13752996.

It is an arithmetic number, because the mean of its divisors is an integer number (13752996).

Almost surely, 2^27505991 is an apocalyptic number.

27505991 is a deficient number, since it is larger than the sum of its proper divisors (1).

27505991 is an equidigital number, since it uses as much as digits as its factorization.

27505991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28350, while the sum is 38.

The square root of 27505991 is about 5244.6154291807. The cubic root of 27505991 is about 301.8624543593.

The spelling of 27505991 in words is "twenty-seven million, five hundred five thousand, nine hundred ninety-one".